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Subject
- a stars13
- absolute magnitude20
- accretion15
- active gal. nuclei1
- active galactic nuclei229
- am stars1
- ap stars10
- apparent magnitude44
- asteroids14
- asteroseismology5
- astrometry18
- astronomical models97
- astronomical object identification30
- astronomical reference materials2
- astrophysical masers15
- atomic physics107
- atomic spectroscopy6
- b stars15
- barium stars4
- be stars41